r-6+a=42

Solution for r-6+a=42 equation:

Simplifying
r + -6 + a = 42

Reorder the terms:
-6 + a + r = 42

Solving
-6 + a + r = 42

Solving for variable 'a'.

Move all terms containing a to the left, all other terms to the right.

Add '6' to each side of the equation.
-6 + a + 6 + r = 42 + 6

Reorder the terms:
-6 + 6 + a + r = 42 + 6

Combine like terms: -6 + 6 = 0
0 + a + r = 42 + 6
a + r = 42 + 6

Combine like terms: 42 + 6 = 48
a + r = 48

Add '-1r' to each side of the equation.
a + r + -1r = 48 + -1r

Combine like terms: r + -1r = 0
a + 0 = 48 + -1r
a = 48 + -1r

Simplifying
a = 48 + -1r